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<blockquote>
<p><strong>[info] RISC-V &#x4E2D;&#x65AD;&#x5BC4;&#x5B58;&#x5668;&#x7684;&#x7EC6;&#x5206;</strong></p>
<p>&#x5728;<a href="part-2.html#&#x6307;&#x5BFC;&#x786C;&#x4EF6;&#x5904;&#x7406;&#x4E2D;&#x65AD;&#x7684;&#x5BC4;&#x5B58;&#x5668;">&#x524D;&#x9762;</a>&#x63D0;&#x5230;&#xFF0C;<code>sie</code> &#x548C; <code>sip</code> &#x5BC4;&#x5B58;&#x5668;&#x5206;&#x522B;&#x4FDD;&#x5B58;&#x4E0D;&#x540C;&#x4E2D;&#x65AD;&#x79CD;&#x7C7B;&#x7684;&#x4F7F;&#x80FD;&#x548C;&#x89E6;&#x53D1;&#x8BB0;&#x5F55;&#x3002;&#x4F8B;&#x5982;&#xFF0C;&#x8F6F;&#x4EF6;&#x4E2D;&#x65AD;&#x7684;&#x4F7F;&#x80FD;&#x662F; <code>sie</code> &#x4E2D;&#x7684; SSIE &#x4F4D;&#xFF0C;&#x89E6;&#x53D1;&#x8BB0;&#x5F55;&#x662F; <code>sip</code> &#x4E2D;&#x7684; SSIP &#x4F4D;&#x3002;</p>
<p>RISC-V &#x4E2D;&#x5C06;&#x4E2D;&#x65AD;&#x5206;&#x4E3A;&#x4E09;&#x79CD;&#xFF1A;</p>
<ul>
<li>&#x8F6F;&#x4EF6;&#x4E2D;&#x65AD;&#xFF08;Software Interrupt&#xFF09;&#xFF0C;&#x5BF9;&#x5E94; SSIE &#x548C; SSIP</li>
<li>&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#xFF08;Timer Interrupt&#xFF09;&#xFF0C;&#x5BF9;&#x5E94; STIE &#x548C; STIP</li>
<li>&#x5916;&#x90E8;&#x4E2D;&#x65AD;&#xFF08;External Interrupt&#xFF09;&#xFF0C;&#x5BF9;&#x5E94; SEIE &#x548C; SEIP</li>
</ul>
</blockquote>
<h3 id="&#x5F00;&#x542F;&#x65F6;&#x949F;&#x4E2D;&#x65AD;">&#x5F00;&#x542F;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</h3>
<p>&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x4E5F;&#x9700;&#x8981;&#x6211;&#x4EEC;&#x5728;&#x521D;&#x59CB;&#x5316;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x65F6;&#x5F00;&#x542F;&#xFF0C;&#x6211;&#x4EEC;&#x540C;&#x6837;&#x53EA;&#x9700;&#x4F7F;&#x7528; riscv &#x5E93;&#x4E2D;&#x63D0;&#x4F9B;&#x7684;&#x63A5;&#x53E3;&#x5373;&#x53EF;&#x3002;</p>
<p></p><p class="code-label">os/src/interrupt/timer.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">//! &#x9884;&#x7EA6;&#x548C;&#x5904;&#x7406;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>

<span class="hljs-keyword">use</span> crate::sbi::set_timer;
<span class="hljs-keyword">use</span> riscv::register::{time, sie, sstatus};

<span class="hljs-comment">/// &#x521D;&#x59CB;&#x5316;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
<span class="hljs-comment">/// </span>
<span class="hljs-comment">/// &#x5F00;&#x542F;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x4F7F;&#x80FD;&#xFF0C;&#x5E76;&#x4E14;&#x9884;&#x7EA6;&#x7B2C;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">init</span></span>() {
    <span class="hljs-keyword">unsafe</span> {
        <span class="hljs-comment">// &#x5F00;&#x542F; STIE&#xFF0C;&#x5141;&#x8BB8;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
        sie::set_stimer(); 
        <span class="hljs-comment">// &#x5F00;&#x542F; SIE&#xFF08;&#x4E0D;&#x662F; sie &#x5BC4;&#x5B58;&#x5668;&#xFF09;&#xFF0C;&#x5141;&#x8BB8;&#x5185;&#x6838;&#x6001;&#x88AB;&#x4E2D;&#x65AD;&#x6253;&#x65AD;</span>
        sstatus::set_sie();
    }
    <span class="hljs-comment">// &#x8BBE;&#x7F6E;&#x4E0B;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
    set_next_timeout();
}
</code></pre>
<p>&#x8FD9;&#x91CC;&#x53EF;&#x80FD;&#x5F15;&#x8D77;&#x8BEF;&#x89E3;&#x7684;&#x662F; <code>sstatus::set_sie()</code>&#xFF0C;&#x5B83;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x5F00;&#x542F; <code>sstatus</code> &#x5BC4;&#x5B58;&#x5668;&#x4E2D;&#x7684; SIE &#x4F4D;&#xFF0C;&#x4E0E; <code>sie</code> &#x5BC4;&#x5B58;&#x5668;&#x65E0;&#x5173;&#x3002;SIE &#x4F4D;&#x51B3;&#x5B9A;&#x4E2D;&#x65AD;&#x662F;&#x5426;&#x80FD;&#x591F;&#x6253;&#x65AD; supervisor &#x7EBF;&#x7A0B;&#x3002;&#x5728;&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5141;&#x8BB8;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x6253;&#x65AD; &#x5185;&#x6838;&#x6001;&#x7EBF;&#x7A0B;&#xFF0C;&#x56E0;&#x6B64;&#x7F6E; SIE &#x4F4D;&#x4E3A; 1&#x3002;<br>&#x53E6;&#x5916;&#xFF0C;&#x65E0;&#x8BBA; SIE &#x4F4D;&#x4E3A;&#x4EC0;&#x4E48;&#x503C;&#xFF0C;&#x4E2D;&#x65AD;&#x90FD;&#x53EF;&#x4EE5;&#x6253;&#x65AD;&#x7528;&#x6237;&#x6001;&#x7684;&#x7EBF;&#x7A0B;&#x3002;</p>
<h3 id="&#x8BBE;&#x7F6E;&#x65F6;&#x949F;&#x4E2D;&#x65AD;">&#x8BBE;&#x7F6E;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</h3>
<p>&#x6BCF;&#x4E00;&#x6B21;&#x7684;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x90FD;&#x9700;&#x8981;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x4E0B;&#x4E00;&#x6B21;&#x4E2D;&#x65AD;&#x7684;&#x65F6;&#x95F4;&#xFF0C;&#x8FD9;&#x6837;&#x786C;&#x4EF6;&#x4F1A;&#x5728;&#x6307;&#x5B9A;&#x7684;&#x65F6;&#x95F4;&#x53D1;&#x51FA;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x3002;&#x4E3A;&#x7B80;&#x5316;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x5B9E;&#x73B0;&#xFF0C;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x53EF;&#x8BF7;&#x6C42;&#xFF08;<code>sbi_call</code> &#x8C03;&#x7528; <code>ecall</code> &#x6307;&#x4EE4;&#xFF09;SBI &#x670D;&#x52A1;&#x6765;&#x5B8C;&#x6210;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x8BBE;&#x7F6E;&#x3002;OpenSBI &#x56FA;&#x4EF6;&#x5728;&#x63A5;&#x5230; SBI &#x670D;&#x52A1;&#x8BF7;&#x6C42;&#x540E;&#xFF0C;&#x4F1A;&#x5E2E;&#x52A9; OS &#x8BBE;&#x7F6E;&#x4E0B;&#x4E00;&#x6B21;&#x8981;&#x89E6;&#x53D1;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x65F6;&#x95F4;&#xFF0C;CPU &#x5728;&#x6267;&#x884C;&#x8FC7;&#x7A0B;&#x4E2D;&#x4F1A;&#x68C0;&#x67E5;&#x5F53;&#x524D;&#x7684;&#x65F6;&#x95F4;&#x95F4;&#x9694;&#x662F;&#x5426;&#x5DF2;&#x7ECF;&#x8D85;&#x8FC7;&#x8BBE;&#x7F6E;&#x7684;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x65F6;&#x95F4;&#x95F4;&#x9694;&#xFF0C;&#x5982;&#x679C;&#x8D85;&#x65F6;&#x5219;&#x4F1A;&#x89E6;&#x53D1;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x3002;
</p><p class="code-label">os/src/sbi.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x8BBE;&#x7F6E;&#x4E0B;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x65F6;&#x95F4;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">set_timer</span></span>(time: usize) {
    sbi_call(SBI_SET_TIMER, time, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>);
}
</code></pre>
<p>&#x4E3A;&#x4E86;&#x4FBF;&#x4E8E;&#x540E;&#x7EED;&#x5904;&#x7406;&#xFF0C;&#x6211;&#x4EEC;&#x8BBE;&#x7F6E;&#x65F6;&#x949F;&#x95F4;&#x9694;&#x4E3A; 100000 &#x4E2A; CPU &#x5468;&#x671F;&#x3002;&#x8D8A;&#x77ED;&#x7684;&#x95F4;&#x9694;&#x53EF;&#x4EE5;&#x8BA9; CPU &#x8C03;&#x5EA6;&#x8D44;&#x6E90;&#x66F4;&#x52A0;&#x7EC6;&#x81F4;&#xFF0C;&#x4F46;&#x540C;&#x65F6;&#x4E5F;&#x4F1A;&#x5BFC;&#x81F4;&#x66F4;&#x591A;&#x8D44;&#x6E90;&#x6D6A;&#x8D39;&#x5728;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x4E0A;&#x3002;</p>
<p></p><p class="code-label">os/src/interrupt/timer.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x95F4;&#x9694;&#xFF0C;&#x5355;&#x4F4D;&#x662F; CPU &#x6307;&#x4EE4;</span>
<span class="hljs-keyword">static</span> INTERVAL: usize = <span class="hljs-number">100000</span>;

<span class="hljs-comment">/// &#x8BBE;&#x7F6E;&#x4E0B;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
<span class="hljs-comment">/// </span>
<span class="hljs-comment">/// &#x83B7;&#x53D6;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#xFF0C;&#x52A0;&#x4E0A;&#x4E2D;&#x65AD;&#x95F4;&#x9694;&#xFF0C;&#x901A;&#x8FC7; SBI &#x8C03;&#x7528;&#x9884;&#x7EA6;&#x4E0B;&#x4E00;&#x6B21;&#x4E2D;&#x65AD;</span>
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">set_next_timeout</span></span>() {
    set_timer(time::read() + INTERVAL);
}
</code></pre>
<p>&#x7531;&#x4E8E;&#x6CA1;&#x6709;&#x4E00;&#x4E2A;&#x63A5;&#x53E3;&#x6765;&#x8BBE;&#x7F6E;&#x56FA;&#x5B9A;&#x91CD;&#x590D;&#x7684;&#x65F6;&#x95F4;&#x4E2D;&#x65AD;&#x95F4;&#x9694;&#xFF0C;&#x56E0;&#x6B64;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5728;&#x6BCF;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x65F6;&#xFF0C;&#x8BBE;&#x7F6E;&#x518D;&#x4E0B;&#x4E00;&#x6B21;&#x7684;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x3002;</p>
<p></p><p class="code-label">os/src/interrupt/timer.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x89E6;&#x53D1;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x8BA1;&#x6570;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">mut</span> TICKS: usize = <span class="hljs-number">0</span>;

<span class="hljs-comment">/// &#x6BCF;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x65F6;&#x8C03;&#x7528;</span>
<span class="hljs-comment">/// </span>
<span class="hljs-comment">/// &#x8BBE;&#x7F6E;&#x4E0B;&#x4E00;&#x6B21;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#xFF0C;&#x540C;&#x65F6;&#x8BA1;&#x6570; +1</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">tick</span></span>() {
    set_next_timeout();
    <span class="hljs-keyword">unsafe</span> {
        TICKS += <span class="hljs-number">1</span>;
        <span class="hljs-keyword">if</span> TICKS % <span class="hljs-number">100</span> == <span class="hljs-number">0</span> {
            <span class="hljs-built_in">println!</span>(<span class="hljs-string">&quot;{} tick&quot;</span>, TICKS);
        }
    }
}
</code></pre>
<h3 id="&#x5B9E;&#x73B0;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x5904;&#x7406;&#x6D41;&#x7A0B;">&#x5B9E;&#x73B0;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x5904;&#x7406;&#x6D41;&#x7A0B;</h3>
<p>&#x63A5;&#x4E0B;&#x6765;&#xFF0C;&#x6211;&#x4EEC;&#x5728; <code>handle_interrupt()</code> &#x6839;&#x636E;&#x4E0D;&#x540C;&#x4E2D;&#x65AD;&#x79CD;&#x7C7B;&#x8FDB;&#x884C;&#x4E0D;&#x540C;&#x7684;&#x5904;&#x7406;&#x6D41;&#x7A0B;&#x3002;</p>
<p></p><p class="code-label">os/src/interrupt/handler.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x4E2D;&#x65AD;&#x7684;&#x5904;&#x7406;&#x5165;&#x53E3;</span>
<span class="hljs-comment">/// </span>
<span class="hljs-comment">/// `interrupt.asm` &#x9996;&#x5148;&#x4FDD;&#x5B58;&#x5BC4;&#x5B58;&#x5668;&#x81F3; Context&#xFF0C;&#x5176;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x548C; scause &#x4EE5;&#x53CA; stval &#x4E00;&#x5E76;&#x4F20;&#x5165;&#x6B64;&#x51FD;&#x6570;</span>
<span class="hljs-comment">/// &#x5177;&#x4F53;&#x7684;&#x4E2D;&#x65AD;&#x7C7B;&#x578B;&#x9700;&#x8981;&#x6839;&#x636E; scause &#x6765;&#x63A8;&#x65AD;&#xFF0C;&#x7136;&#x540E;&#x5206;&#x522B;&#x5904;&#x7406;</span>
<span class="hljs-meta">#[no_mangle]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">handle_interrupt</span></span>(context: &amp;<span class="hljs-keyword">mut</span> Context, scause: Scause, stval: usize) {
    <span class="hljs-comment">// &#x53EF;&#x4EE5;&#x901A;&#x8FC7; Debug &#x6765;&#x67E5;&#x770B;&#x53D1;&#x751F;&#x4E86;&#x4EC0;&#x4E48;&#x4E2D;&#x65AD;</span>
    <span class="hljs-comment">// println!(&quot;{:x?}&quot;, context.scause.cause());</span>
    <span class="hljs-keyword">match</span> scause.cause() {
        <span class="hljs-comment">// &#x65AD;&#x70B9;&#x4E2D;&#x65AD;&#xFF08;ebreak&#xFF09;</span>
        Trap::Exception(Exception::Breakpoint) =&gt; breakpoint(context),
        <span class="hljs-comment">// &#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
        Trap::Interrupt(Interrupt::SupervisorTimer) =&gt; supervisor_timer(context),
        <span class="hljs-comment">// &#x5176;&#x4ED6;&#x60C5;&#x51B5;&#xFF0C;&#x7EC8;&#x6B62;&#x5F53;&#x524D;&#x7EBF;&#x7A0B;</span>
        _ =&gt; fault(context, scause, stval),
    }
}

<span class="hljs-comment">/// &#x5904;&#x7406; ebreak &#x65AD;&#x70B9;</span>
<span class="hljs-comment">/// </span>
<span class="hljs-comment">/// &#x7EE7;&#x7EED;&#x6267;&#x884C;&#xFF0C;&#x5176;&#x4E2D; `sepc` &#x589E;&#x52A0; 2 &#x5B57;&#x8282;&#xFF0C;&#x4EE5;&#x8DF3;&#x8FC7;&#x5F53;&#x524D;&#x8FD9;&#x6761; `ebreak` &#x6307;&#x4EE4;</span>
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">breakpoint</span></span>(context: &amp;<span class="hljs-keyword">mut</span> Context) {
    <span class="hljs-built_in">println!</span>(<span class="hljs-string">&quot;Breakpoint at 0x{:x}&quot;</span>, context.sepc);
    context.sepc += <span class="hljs-number">2</span>;
}

<span class="hljs-comment">/// &#x5904;&#x7406;&#x65F6;&#x949F;&#x4E2D;&#x65AD;</span>
<span class="hljs-comment">/// </span>
<span class="hljs-comment">/// &#x76EE;&#x524D;&#x53EA;&#x4F1A;&#x5728; [`timer`] &#x6A21;&#x5757;&#x4E2D;&#x8FDB;&#x884C;&#x8BA1;&#x6570;</span>
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">supervisor_timer</span></span>(_: &amp;Context) {
    timer::tick();
}

<span class="hljs-comment">/// &#x51FA;&#x73B0;&#x672A;&#x80FD;&#x89E3;&#x51B3;&#x7684;&#x5F02;&#x5E38;</span>
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">fault</span></span>(context: &amp;<span class="hljs-keyword">mut</span> Context, scause: Scause, stval: usize) {
    <span class="hljs-built_in">panic!</span>(
        <span class="hljs-string">&quot;Unresolved interrupt: {:?}\n{:x?}\nstval: {:x}&quot;</span>,
        scause.cause(),
        context,
        stval
    );
}
</code></pre>
<p>&#x81F3;&#x6B64;&#xFF0C;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x5C31;&#x53EF;&#x4EE5;&#x6B63;&#x5E38;&#x5DE5;&#x4F5C;&#x4E86;&#x3002;&#x6211;&#x4EEC;&#x5728; <code>os/interrupt/mod.rs</code> &#x4E2D;&#x5F15;&#x5165; <code>mod timer</code> &#x5E76;&#x5728; &#x521D;&#x59CB;&#x5316; <code>handler::init()</code> &#x8BED;&#x53E5;&#x7684;&#x540E;&#x9762;&#x52A0;&#x5165; <code>timer::init()</code> &#x5C31;&#x6210;&#x529F;&#x52A0;&#x8F7D;&#x4E86;&#x6A21;&#x5757;&#x3002;</p>
<p>&#x6700;&#x540E;&#x6211;&#x4EEC;&#x5728; main &#x51FD;&#x6570;&#x4E2D;&#x53BB;&#x6389; <code>unreachable!()</code>&#xFF0C;&#x7136;&#x540E;&#x89C2;&#x5BDF;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x3002;&#x5E94;&#x5F53;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x7A0B;&#x5E8F;&#x6BCF;&#x9694;&#x4E00;&#x79D2;&#x5DE6;&#x53F3;&#x8FDB;&#x884C;&#x4E00;&#x6B21;&#x8F93;&#x51FA; <code>100 ticks</code> <code>200 ticks</code>&#x2026;&#x2026;</p>
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